Expansion well-drill



(No Model.)

W. S. GREEN.

EXPANSION WELL'DRILL. No. 369,403. I Patented Sept. 6, 1887.

WITNESSES [JV N To B NV PETIRS. Phuwmho n nw. Washinglan. D. C.

UNITED STATES WILLIAM S. GREEN, OF ELLSW'ORTH, KANSAS.

EXPANSION WELL DRlLL.

SPECIFICATION forming part of Letters Patent No. 369,403, datedSeptember 6, 1887.

Application filed December 1, 1886.

To aZZ whom it may concern:

Be it known that 1, WILLIAM S. GREEN, of Ellsworth, in the county ofEllsworth and State of Kansas, have invented certain new and usefulImprovements in Expansion Vell- Drills; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use the same. a

My invention relates to expansion welldrills, the object being toprovide a device of this character of cheap and durable construction.

The invention consists in the features of construction and combinationof parts, hereinafter fully described, and pointed out in the claims.

In the drawings, Figure I represents a side elevation of my improveddrill with the bits in closed position. Fig. II is a similar view withthe bits expanded; and Figs. Ill, IV, V, VI, and VII show the parts ofthe improve ments detached.

A represents the drill-shank, connected by a coupling, a, to adrill-rod, B. The shank A is screw-threaded, as shown at a, and isprovided at its lower end with a contracted or reduced portion, 0, whichterminates in a head or enlargement, D. The shank A is also formed withdiametrically opposite depressions 0r slots 0 c.

E E represent the bit-sections of the drill, each of which is recessed011 its inner side to receive the head D of the shank, to which the bitsare pivoted by pins (1. Each bit is provided with an upper threadedextension, F, which is inclined on its inner side and provided with alog, f, adapted to enter the slots 0 c of the shank.

C- represents an internally-threaded thimble arranged upon the shankA,and provided with oppositely-arranged wings or lugs 9, adapted toenter grooves or guides in the drill-tube within which the device works,to prevent the thimble from turning. The thiinble is also adapted toinclose the upper threaded ends of Serial No. 220,410. (No model.)

(not shown,) and the thimble is brought in contact with the threadedupper ends by turning the drill-rod. The bitsections are grooved ontheir outer sides to form V-shaped ends; but any preferred form ofcutting or drilling points may be employed.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination, with a screw-threaded shank, of bitscctionspivotally secured to the lower end of said shank and provided withthreaded upper ends, and a threaded thinible arranged upon the shank toengage the upper ends of the bit-sections, substantially as described.

2. The combination, with the screw-shank and drill-rod, of bit-sectionspivoted on each side of the head of the shank and provided with threadedupper ends, and an internally threaded thiinble to engage said upperends of the bit-sections and formed with oppositelyprojecting lugs orfins, substantially as described.

3. The combination, with the screw-shank provided with a head and acontracted lower end, as described, and formed with oppositedepressions, of the bit-sections pivotally secured to said head andhaving the threaded upper ends and projecting lugs, substantially asdescribed, and a threaded thimble to engage the uppercnds ofthebit-sections to cause their lower ends to expand, substantially asdescribed.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

WILLIAM S. GREEN.

Vitnesses:

W. T. Annnnson, W. F. INGRAM.

